On 15.04.2016 15:57, Jean-Michaël Celerier wrote:
On Fri, Apr 15, 2016 at 12:15 PM, Igor Mironchik
<[email protected] <mailto:[email protected]>> wrote:
Can I ask you why you need to migrate from QGraphicsScene to QtQuick?
Hi,
I like the scene graph rendering being done in another thread, and
more importantly
I wish to provide the ability to write plug-ins in QML for my
software, which is
much easier than C++ for the end-user.
I'll try overriding QQuickItem but what I am not able to grasp is how
everything is supposed to happen in
term of scene management.
Can I just keep the same parent - children relationship ?
I think so.
Do transforms work the same ?
For instance I don't see boundingRect in QQuickItem and many of the
"more graphical"
functions seems to be split between QQuickItem and various QSGNode[...].
All visual QML items are rendered using the scene graph, a low-level,
high-performance rendering stack, closely tied to OpenGL. It is possible
for subclasses ofQQuickItem <http://doc.qt.io/qt-5/qquickitem.html>to
add their own custom content into the scene graph by setting
theQQuickItem::ItemHasContents
<http://doc.qt.io/qt-5/qquickitem.html#Flag-enum>flag and reimplementing
theQQuickItem::updatePaintNode
<http://doc.qt.io/qt-5/qquickitem.html#updatePaintNode>() function.
*Warning:*It is crucial that OpenGL operations and interaction with the
scene graph happens exclusively on the rendering thread, primarily
during theupdatePaintNode
<http://doc.qt.io/qt-5/qquickitem.html#updatePaintNode>() call. The best
rule of thumb is to only use classes with the "QSG" prefix inside
theQQuickItem::updatePaintNode
<http://doc.qt.io/qt-5/qquickitem.html#updatePaintNode>() function.
*Note:*All classes with QSG prefix should be used solely on the scene
graph's rendering thread. SeeScene Graph and Rendering
<http://doc.qt.io/qt-5/qtquick-visualcanvas-scenegraph.html#scene-graph-and-rendering>for
more information.
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